Anton

db.collection.aggregate({
  "$group": {
    _id: {
      item: "$item",
      status: "$status"
    },
    count: {
      $sum: 1
    }
  }
},
{
  "$group": {
    _id: {
      item: "$_id.item"
    },
    count: {
      $sum: "$count"
    },
    status: {
      "$push": {
        status: "$_id.status",
        count: "$count"
      }
    }
  }
})

db.users.aggregate({$match: {active:true}},
{$lookup:
{ from: "org", localField: "org.id", foreignField: "guid", as: "org"},
{$unwind: "$org"},
{$match: {"org.docStatus": {$ne: "delete"}, "org.isAuthorized": true},
{$group: { _id: "$_id"}})